IPSwitch

AttachDataLink DetachDataLink FindActiveDataLink HandlePDU NotifyNetworkChange RegisterForNetworkEvents ReinitializeClass WritePDU

Attributes

Enabled Enabled

Fields

instance IPSwitch tag;
        enabled: false;
         daemon: nilObject;
     notifyList: nilObject;
end instance;

//
// IP multiplexer class
//
Define Class IPSwitch;
    inherits from Object;
    inherits from PDUClientInterface;
    inherits from PDUServiceInterface;

    field daemon:       IPDaemon, weak;
        // Actor used for periodic IP tasks. Only exists while IP is
        // in use.
    field notifyList:   DenseObjectList;
        // List of objects wanting to be notified of the data link
        // going up or down.

    overrides Enabled;
        // Returns true if IP is active.
    overrides SetEnabled;
        // DO NOT USE (enabled state is read only).

    operation AttachDataLink(dataLink: DataLinkServer; provider: InternetProvider);
        // Attach the active data link (connected to the given InternetProvider) 
        // to the IP switch.
    operation DetachDataLink(dataLink: DataLinkServer);
        // Remove the data link from the IP switch.
    operation FindActiveDataLink(provider: InternetProvider): DataLinkServer;
        // Find an active data link that is connected to the given InternetProvider;
        // passing nilObject returns the first active data link found.

    operation RegisterForNetworkEvents(irritant: Object; add: Boolean);
        // Registers a WantNetworkEvents subclass for notification of
        // network events. Applications should not need to call this
        // method directly since WantsNetworkEvents automatically
        // registers the object during Init, Reinitialize, and Copy.
        // Only call this if you have specifically overriden these
        // methods and wish to register the objects manually.
    operation NotifyNetworkChange(dataLink: DataLinkServer; up: Boolean);
        // Sends out notifications to all objects registered to
        // receive network events. The "dataLink" should be the link
        // server which is either coming up or going down, and "up"
        // specifies which of the two events are happening.

    overrides WritePDU;
        // Send an assembled packet via IP.
        //
        // NOTE: this operation is only for use by transport layer
        // protocols (e.g. TCP and UDP). Applications software should
        // not use this method to send data; use the transport
        // protocol APIs instead.

    overrides ReinitializeClass;
    overrides HandlePDU;
end class;